Mercury pollution is dangerous to health. Previous research was found two potential Gram-negative bacteria for mercury bioremediation, from gold mining in Central Kalimantan, Indonesia. These isolates were identified as Pseudomonas aeruginosa KHY2 and Klebsiella pneumonia KHY3. Mechanisms of mercury bioremediation had not known yet by these isolates. This study purposed to test the role of coenzymes on mercury bioremediation by these isolate and to determine the coenzymes best level of mercury bioremediation. Experimental design was Completely Randomized Design in a laboratory. Treatment factors were coenzymes obtained from vitamins B1, B6, B12, with 6 levels of treatments, included 1 control. All treatments were done in Luria Broth media that contain 12 ppm of mercury. Mercury was measured by AAS Shimadzu AA-6200. The results showed that coenzymes effect was very significant to improve mercury bioremediation by P. aeruginosa KHY2 and K. pneumonia KHY3. Supplementation of vitamin B12 in culture media, more enhance of mercury bioremediation compared with vitamin B1 and B6. These result above, indicated the mechanism of mercury bioremediation in both isolates, were the enzymatic process.

Blumea balsamifera, Croton tiglium, Metroxylon sagu, and Fagraea racemosa are used as traditional antifertility of Dayak people in Central Kalimantan. These study aims at finding out the potential plants as antifertility with the use on Swiss Webster (SW) mice. Extracts of B. balsamifera, C. tiglium, M. sagu, and F. racemosa were administered by gavage at the dose level of 0.26 mg/kg body weight (b.w) to female of SW mice for 8 days to examine their estrous cycle. To determine the anti-fertility, the procedure was to administer 0.26 mg/kg b.w of plant extract by gavageto female SW mice and mated it with normal male of SW mice. Estrous cycle were analyzed every day for 9 days and the reproduction display was examined 15 days after fertilization. The results show that there is an inhibitation in estrous cycle, particularly on estrus and metestrus phases for all of the traditional plant extracts. The reproduction display shows a decrease in the number of live fetuses, number of corpus luteum and body weight of the dam mice treated. The decrease in the corpus luteum further and fetuses attributes antifertilty effect of extract to inhibit foliculogenesis. Out of four extracts tested, the extract of B. balsamifera seems to be more potential for antifertility activities when compared with other traditional plant extracts.

Penelitian ini dilatarbelakangi oleh adanya guru yang masih melakukan proses pembelajaran secara tekstual dengan menggunakan LKS yang masih memiliki keterbatasan. Tujuan penelitian ini adalah untuk mengetahui peningkatan keterampilan proses sains siswa menggunakan perangkat pembelajaran LKS Blended learning berbasis web materi pencemaran lingkungan. Jenis penelitian ini adalah penelitian Research and Development (R&D). Prosedur penelitian mengadaptasi model pengembangan ADDIE. Penelitian dilaksanakan pada semester genap tahun ajaran 2020/2021 di SMPN 3 Menthobi Raya Kabupaten Lamandau pada siswa kelas VII. Peningkatan keterampilan proses sains siswa siswa diukur dengan tes objektif dan dianalisis dengan N-gain. Berdasarkan hasil penelitian dapat disimpulkan bahwa N-gain keterampilan proses sains siswa mencapai rata-rata 0,72 uji skala kecil dan 0,84 uji skala besar. LKS blended learning berbasis web pada materi pencemaran lingkungan dapat meningkatkan keterampilan proses sains siswa.

Ilalang (Imperata cylindrica) termasuk famili Poaceae. Akar tumbuhan ini oleh sebagian masyarakat di Kalimantan Tengah digunakan untuk meningkatkan stamina. Masyarakat yang memanfaatkan air rebusan akar ilalang agar tidak mudah lelah. Tujuan penelitian ini untuk mengetahui khasiat air rebusan ilalang terhadap stamina mencit Swiss Webster jantan. Penelitian ini dilakukan dengan acar menghitung frekuensi tunggangan mencit jantan selama satu jam. Penelitian ini merupakan penelitian eksperimen dengan menggunakan Rancangan Acak Lengkap (RAL) dengan 4 perlakuan dan masing-masing perlakuan memiliki 6 kali ulangan. Masing-masing perlakuan menggunakan akuades, minuman berenergi 13 mL/kg BB, Rebusan air akar ilalang 9 mL/kg BB, dan rebusan air akar ilalang 18 mL/kg BB. Analisis data menggunakan aplikasi spss PASW versi 18 dengan uji ANOVA 1 arah (one way anova) dan uji lanjut Duncan’s Multiple Range Test (DMRT) dengan tingkat kepercayaan 95%. Hasil penelitian menunjukkan air rebusan akar ilalang meningkatkan stamina mencit jantan secara nyata (Fhit 11,51 > Ftab 3,10). Hasil uji lanjut menggunakan DMRT menunjukkan pemberian air rebusan akar ilalang 18 mL/kg BB memiliki rata-rata frekuensi kawin tertinggi 47,50 kali dibandingkan dengan tiga kelompok perlakuan lainnya. Kesimpulan; air rebusan akar ilalang meningkatkan stamina mencit Swiss Webster jantan.

The water is very important to human lives. The best and most appropriate way to have an adequate supply of water is to use solar energy to drive pumps instead of using fossil energy. This research was conducted as a comparative study of a conventional submersible AC motor-pump driven by a photovoltaic system using two types of AC motor which are single-phase and three-phase submersible water pumps. The performance of the system was measured according to the standard test procedure in IEC 62253: 2011 while the depth of the well was simulated by an adjustable pump discharge pressure and a pump installed in a predetermined location of 40 meters. The results showed that the three-phase pump supplied more water and has a good response as indicated by a low irradiance of approximately 75 Watt/m 2 in the morning, around 06.15 AM which runs the pump motor effectively while the one-phase pump required a higher irradiance of 750 Watt/m 2 at around 10.30 A.M. Moreover, the PVWPS system with the three-phase pump also had higher efficiency and PR values with 0.64 and 0.40598 respectively than the system with the single-phase with 0.48 and 0.21388.